在C整数的大小取决于什么？ [英] integer size in c depends on what?

问题描述

整数的大小取决于什么？是否是编译器相关的或依赖MACHIN？

Size of the integer depends on what?whether it is compiler dependent or machin dependent?

推荐答案

这是实现相关。 C标准只要求：

It's implementation-dependent. The C standard only requires that:

• 字符已至少有8位


• 短至少有16位


• INT 至少有16位


• 长至少有32位


• 长长已至少有64位（1999年加入）


• 的sizeof（char）的和乐;的sizeof（短）文件;的sizeof（INT）及乐;的sizeof（长）乐;的sizeof（久长）

• char has at least 8 bits
• short has at least 16 bits
• int has at least 16 bits
• long has at least 32 bits
• long long has at least 64 bits (added in 1999)
• sizeof(char) ≤ sizeof(short) ≤ sizeof(int) ≤ sizeof(long) ≤ sizeof(long long)

在16位/ 32位的天，的实际的标准是：

In the 16/32-bit days, the de facto standard was:

• INT 是原生整数大小


• 其他类型被最小尺寸允许

• int was the "native" integer size
• the other types were the minimum size allowed

不过，64位系统通常做的不的让 INT 64位，这将创造有三个的尴尬局面64位类型和没有32位的类型。的部分的编译器扩展长为64位。

However, 64-bit systems generally did not make int 64 bits, which would have created the awkward situation of having three 64-bit types and no 32-bit type. Some compilers expanded long to 64 bits.

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